package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * <p>
 *
 * </p>
 * @author zh
 * @date 2024-07-11 20:23
 */
@Service
@Slf4j
public class UserServiceImpl implements UserService {

    // 微信服务接口地址
    private static final String WECHAT_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxlogin(UserLoginDTO userLoginDTO) {
        log.info("openid:{}", userLoginDTO);

        // 调用微信接口服务，获得当前微信用户的 openid
        String openid = getOpenid(userLoginDTO.getCode());

        if(openid.isEmpty() || "".equals(openid) || openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);

        if(user == null){
            // 新用户则自动注册
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        // 返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获得当前微信用户的 openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        // 调用微信接口服务，获得当前微信用户的 openid
        Map<String, String> map = new HashMap<String,String>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        // 发送请求，并返回openid
        String json = HttpClientUtil.doGet(WECHAT_LOGIN_URL, map);
        // 判断openid是否为空，如果为空表示登录失败，抛出业务异常
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        // 返回openid
        return openid;
    }

}
